MP5K

It was first seen used in the Worldwide Reveal Trailer by the Russian F.S.B. teams. In Single-Player, it has been seen used by the Brazilian Militia in Takedown, and later on it is used by Task Force 141 while freeing Prisoner 627. The version shown is externally modified with Picatinny rails to more easily mount attachments. The barrel length on the MP5K is closer to a later version, the MP5K-PDW, which has a slightly longer barrel in order to improve accuracy back to full-size MP5 levels. However, that variant also came with a folding stock.